SSP
PubMatic
pubmatic.com
PubMatic is an independent sell-side platform for web, in-app and CTV inventory.
Most of the 227,403 apps that declare pubmatic.com reach it through a reseller: 99% have a RESELLER line, 40% a DIRECT one (37,278 files, 25,902 of them through LoopMe's account). Of 3,103,873 lines checked against its sellers.json (6,498 sellers), 83% match, 9.9% name an unlisted account and 3% declare the wrong seller type. 2 sellers left its sellers.json in the last 30 days.
- Apps declaring it
- 227,403
- Sellers in sellers.json
- 6,498
- Lines verified
- 83%
- Lines with errors
- 402,104
- Avg. supply path score
- 52.8 / 100
90,284 DIRECT · 226,014 RESELLER
0% confidential
2,580,286 of 3,114,773 checked lines
3,114,773 lines in total
223,516 apps scored
App counts, the sellers.json breakdown and the directory ranking are as of , recomputed daily (the same numbers as the directory). Line counts are recounted every 10 minutes. sellers.json last read 13 October 2026. The supply path score sums up how short and clean the declared paths are, 0 to 100 (how it is computed).
How to add PubMatic to app-ads.txt
One line per account, in the app-ads.txt at the root of the domain your App Store and Google Play listings name as the developer website.
pubmatic.com, YOUR_ACCOUNT_ID, DIRECT, 5d62403b186f2ace
pubmatic.com, YOUR_ACCOUNT_ID, RESELLER, 5d62403b186f2ace- Field 1:
pubmatic.com, the domain PubMatic uses in app-ads.txt. - Field 2: your account ID with PubMatic. It must equal the
seller_idin PubMatic's sellers.json. - Field 3: DIRECT if you hold the account, RESELLER if a partner holds it and sells your inventory. DIRECT vs RESELLER
- Field 4 (optional):
5d62403b186f2ace, the certification authority ID on 97% of the lines naming pubmatic.com.
sellers.json at a glance
- Status
- Published
- Sellers listed
- 6,498
- Confidential
- 0 (0%)
- Passthrough
- 0
- Removed, last 30 days
- 2
- Last read
- Oct 13, 2026
- PUBLISHER3,554
- INTERMEDIARY2,654
- BOTH272
Cross-check of lines naming pubmatic.com
- Verified 2,580,286
- Seller ID not found 308,138
- DIRECT but intermediary 37,758
- RESELLER but publisher 56,208
- Seller type BOTH 132,383
- Confidential seller 0
- No sellers.json 0
- Unchecked 0
Every line naming pubmatic.com is looked up in its sellers.json. What each status means
Common errors with pubmatic.com lines
-
Seller ID not found
308,138 lines
Ask PubMatic for the account ID it lists for you in its sellers.json, correct the line, or remove it if you no longer work with them. Buyers that check sellers.json drop these paths.
-
Seller type BOTH
132,383 lines
The account is listed as BOTH, so sellers.json alone cannot tell a buyer which relationship applies. Nothing to fix on your side; buyers usually look at the seller's domain.
-
RESELLER but publisher
56,208 lines
If the account is yours, declare it DIRECT. If a partner holds it, ask PubMatic why the account is listed as PUBLISHER.
-
DIRECT but intermediary
37,758 lines
If a partner holds this account and resells your inventory, the line should say RESELLER. If the account is yours, ask PubMatic to list it as PUBLISHER.
Intermediaries most declared as RESELLER
Accounts on pubmatic.com that its sellers.json lists as INTERMEDIARY or BOTH, by the number of app-ads.txt files declaring them. Confidential sellers are left out.
| Seller domain | Type | Files |
|---|---|---|
| loopme.com | INTERMEDIARY | 25,902 |
| taurusx.com | INTERMEDIARY | 22,928 |
| admanmedia.com | INTERMEDIARY | 22,611 |
| appads.in | INTERMEDIARY | 22,499 |
| pokkt.com | INTERMEDIARY | 22,323 |
| bigo.sg | INTERMEDIARY | 22,266 |
| zmaticoo.com | INTERMEDIARY | 22,241 |
| algorix.co | INTERMEDIARY | 21,582 |
Apps that declare pubmatic.com
| App | Store | Relationship | Status |
|---|---|---|---|
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| iOS | DIRECT | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live | |
| Android | DIRECT + RESELLER | Live |
Questions about PubMatic
Does PubMatic publish a sellers.json?
Yes. Its file at https://cdn.pubmatic.com/sellers/data/sellers.json listed 6,498 sellers when we last read it on 13 October 2026: 3,554 publishers, 2,654 intermediaries and 272 listed as both; 0% are confidential.
How many apps declare PubMatic in app-ads.txt?
227,403 apps in Stoqlab's data (delisted apps included) declare pubmatic.com: 90,284 with at least one DIRECT line and 226,014 with at least one RESELLER line, across 37,278 app-ads.txt files, as of 14 October 2026 (recounted daily).
What is the certification authority ID for PubMatic?
97% of the app-ads.txt lines naming pubmatic.com carry "5d62403b186f2ace" in the fourth field. The field is optional; the IAB Tech Lab ads.txt 1.1 specification says identifiers in sellers.json supersede it, so a missing or different value does not make a line invalid.
Why do pubmatic.com lines fail verification?
Of 3,114,773 lines naming pubmatic.com, 402,104 contradict its sellers.json. The most common case is "Seller ID not found", on 308,138 lines. Ask PubMatic for the account ID it lists for you in its sellers.json, correct the line, or remove it if you no longer work with them. Buyers that check sellers.json drop these paths.
Not sure whether your line should say DIRECT or RESELLER? DIRECT vs RESELLER in app-ads.txt
Sources: the public app-ads.txt files of tracked apps and the sellers.json of pubmatic.com. Something wrong? Tell us.